Add plot_interactive to MvNormal

[rohanbabbar04]

closes #225

Description

• Added plot_interactive to MvNormal.
• Add tests for plot_interactive.
• Add xy_lim to plot_mvnormal.

Checklist

• Code style is correct (follows pylint and black guidelines)
• Includes new or updated tests to cover the new feature
• New features are properly documented (with an example if appropriate)
• Widget states have been properly saved (only for notebooks with widgets) see for details.

Image for the method

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.22642% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 86.43%. Comparing base (6afa0e5) to head (eea25ac).

Files	Patch %	Lines
preliz/internal/plot_helper_multivariate.py	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
+ Coverage   86.20%   86.43%   +0.23%     
==========================================
  Files          36       36              
  Lines        4190     4240      +50     
==========================================
+ Hits         3612     3665      +53     
+ Misses        578      575       -3     

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